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Compositor: reuse column LUT buffer to avoid per-call allocations (Unit 4)

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gramps
2026-10-05 16:18:26 -07:00
parent 77d5120c87
commit dc1343896d
1 changed files with 6 additions and 1 deletions
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Services/Compositor/SceneCompositor.cs
+6 -1
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@@ -32,6 +32,7 @@ public sealed class SceneCompositor
private static readonly Dictionary<SceneElement, VideoFrame> _elementRasters = new(ReferenceEqualityComparer.Instance); private static readonly Dictionary<SceneElement, VideoFrame> _elementRasters = new(ReferenceEqualityComparer.Instance);
private static readonly object _pasteGate = new(); private static readonly object _pasteGate = new();
private const int MaxPasteEntries = 256; private const int MaxPasteEntries = 256;
private static float[] _sxLutCache = Array.Empty<float>();
/// <summary> /// <summary>
/// Composite <paramref name="scene"/> into the tier's output frame. Layer order (back → /// Composite <paramref name="scene"/> into the tier's output frame. Layer order (back →
@@ -547,7 +548,11 @@ public sealed class SceneCompositor
// Build horizontal LUT for scaled blit to reduce per-pixel divides // Build horizontal LUT for scaled blit to reduce per-pixel divides
var lutCount = x1 - x0 + 1; var lutCount = x1 - x0 + 1;
var sxLut = new float[lutCount]; if (_sxLutCache.Length < lutCount)
{
_sxLutCache = new float[Math.Max(lutCount, 4096)];
}
var sxLut = _sxLutCache;
var pxBase = x0 - ex; var pxBase = x0 - ex;
for (var xi = 0; xi < lutCount; xi++) for (var xi = 0; xi < lutCount; xi++)
{ {